Hey gang, guess what? Our flies may not be our own or nearby hatchings. The flies we call stable flies have been netted as high as 5 mi, cruising along with the winds up there and can travel from California to mid way across the US in a matter of hours. Pretty hard to control that. After waging war on the worst all that works is a dark, dark shelter during the day as the biters prefer daylight. The horses go out toward dark and come in before 9 am when the bugs are at their worst.